The goal of the facebow transfer is to have the maxillary cast mounted on the instrument; in the exact same relationship the maxilla is oriented to the skull when the patient is standing up straight. The distance from the maxillary incisal edge to the axis of rotation of the mandible should also be duplicated.
The Slide-o-matic facebow (Whipmix) is an example of a simple ear-bow, which can be utilized to mount the maxillary cast along with a rigid bite registration material. We also recommend using a bubble level to be sure the facebow is level with the floor when the patient is standing upright. This is important, because some patient’s ears are not level, which can lead to the incorporation of a cant to the maxillary incisal plane.
A peel and stick level that allows the
dentist and the assistant to assure
that the facebow is level with the floor
when the patient is standing upright.